You can find this filter through
-> -> .
The Hurl filter changes each affected pixel to a random color, so it
produces real random noise. All color channels,
including an alpha channel (if it is present) are randomized. All
possible values are assigned with the same probability. The original
values are not taken into account. All or only some pixels in an active
layer or selection are affected, the percentage of affected pixels is
determined by the Randomization (%) option.